Carbureter.



A. HATHUOGK.

UARBURETER. APPLICATION. FILED 001". a. 1911.

1, 1g5 525 Patented Jan. 19, 1915.

WITNE$5ES INVENTOR ALIUS l'IATHCGCK, OF SAN S QFFQE;

raancrsco, oamronrne.

CARBURETER.

If This invention relates to improvements in n carbureters -and especially in the valve mechanism thereof, the-object of the invention being to provide a carbureter in which the quantities supplied of air and carbonaceous gas may be exactly proportioned to o give "the best result. I

In the accompanying drawing, the figure is a vertical section of va carbureter con;

structed in accordance with my invention,

the mixing chamber being shown in side elevation.

Referring to the drawing, within the casing 1 of the inixing chamber theconstruction of which is immaterial to the present invention, is screwed theneck 2 ofan air chamber casing 3, which has a cylindrical tubular portion or guide 4; which extends partly below and partly above the bottom of the air chamber. Upon the reduced threaded end 5 of said tubular portion 4 is screwed a nut G-between which nut anda shoulder 7 of said tubular portion l is secured a float chamber casing 8, the upper edge 52 of which makesia tight joint with a circular portion of the air chamber cas- 5 ing 3. Gasolene is supplied to said float chamber by i i-nipple 11 in itslcasing'. the conduit of which is controlled by a needle valve 12, carried by an exijiension l3 rigidly secured to a float 14, hinge as shown at 15, to the inner side of the float chamber casing. Said float serves to automatically control the flow of gasolene into the float chamber, and it is suitablv apertured at the center to permit the guide 4 to pass therethr'ough. 1 Receivedwithin said tubular guide 4 is a tube 16, the upper end of which is screwed Within the lower end of a valve tube 17 formed integral with, and depending from,

a valve 18. which valve is thin and circular 59 and has itsoutcr circular edge 19 beveled.

'or flaring upwardly ail/l provided with a The tube 16 has a' closed 'bottoin 22,.

through which extends alliarrow vertical Specificationof Letters 2mm.

Patented Jan. 1o, 1am.

Application filed October 3, i911. SerialNo. 652,558.

gasolene tube 23 rigidly secured to said bottom and therefore movable with the valve tube and valve" G'asolene from the float chamber passes through-a "number of con duits 24 formed in the lower portion of the guide at and enters the bottom of saidtube 23, the size ofthe enteringpassagebeing regulated by means ofa screw 25 screwed in'Ithc bottom of said guide. Through the a; tube 23, immediately above the bottom of the. annular chamber 16, are formed small apertures 10, one only. being here shown, to afford communication between said tube 23 and annular tube 16. By the suction of the 3 0 engine in the vusual -manner, gasoleneis drawn up through said tube 23 and out through the upper end thereof, which is above the level of air holes 26 formed in the valve tube, by which air is admitted 4 "from the air chamber to the interior of said valve tube. The gasolene vapor and air are -vn up through saidvalve tube, and to rent any gasolene creeping over the upper surface of said valve, said surface is so made (llSlI-ShHfJEd OI depressed toward the center, as shown at 27. to permit the gasolene to drain back into the float chamber. and there is fitted tightly within said valve I tube an inner thimble 2 8 having a suitable number of small perforations 29 to ermit, of said drainage, and the upper e ge of which thimble 28 extends a suliicient height above the immediately surrounding portion of the upper surface of the valve, so that said creeping cannot take place. The thimble 28 serves an additional ofiice of providing, by its vertical adjustment in the valve tube, for the regulation of the size of the air openings 26. It will be observed that the lower edge of said thimble is below the top of the tube 23, so that the air passing through said openings 26 has to assume an u ward direction when flowing in prox imitv to the gasolene particles flowing upwardly in the tube 23, and therefore assists in vaporizing the same.v At the same time these openings for the admission of air are direct, and not circuitous, so that the air can pass very freely to mix'with the gasolene vapor. v I

The apertures 10 by which the tube 23 communicates with the an'nular tube 26.

form an important feature of my invention.

If these perforations did not exist, then it would be nece H ry for the gasolene to till the entire tube a3 to the top thereoi, before lOQ the gasolene could arrive at a point at which air can mix with the vapor, the mixture of air facilitating the yaporization of the gasolene. This would necessitate, in addition to the suction required tofdrawthe carbureted:

air to the 'engine', a suction sufiicient to pm "duce a column of gasolene of the height/9f the top of the Qllb6f23 above the apertures h 10.- By forming sa'd apertures 10, this col-x 1'0 I the interior of the/tube23', the air being able.

umn is broken by the admission of air to to flow downby. the annular chamber 16,

so, thgit the carbure'ted mixture is drawn up through said tube 23 from the apertures same as the level in the float chamber. Then when the engine is started again it is possi- .ble--to obtain a large amount of gasolene vapor for starting from the very considerable amount of gasolene surface that is exposed to the suction of the engine, thus greatly facilitating the starting.

By the-suction ofthe engine, not only is gasolene vapor drawn from the tube 23 and I air through the holes26', but the valve itself is lifted from its seat so that air is drawn from 'the. air chamber between said valve and its seat.- To prevent the valve being. raised too high by said suction, there ispro- 35 vided a coiled spring. 30 surrounding thevalve tube, the lower end of which presses dd'wnwardly upon an outwardly extending filings 31, of said valve tube, while the upper end presses upwardly against a fiange32 extending inwardly from a tube 33 surrounding the valve tube. This. tube 33 is supported, indirectly, as will hereinafter appear, by' arms 34; extending obliquely downward and inward from the wall of the air chamber.

In order to accurately adjust the air inlet opening, I- provide means for varying the pressure exerted by the coiled spring, which pressure resists the upward pull upon the valve caused by the suction of the engine. This I do by varying the height of the tube 33, which is formed with an external thread 35, which is screwed into an internal thread in a bevel wheel '36, which bevel gear is engaged by a bevel-.pinion 37 on a shaft 38 rotated in a sleeve 39 screwed through the air rhamber casing, which shaft is turned by a head 40, between which head and the sleeve 39 a coiled spring 41 is compressed, thus holding the bevel pinion against the end of the sleeve. The upper side of the bevel gear is formed with a circular groove 42wh1ch is engaged by a ring 43 carried by said arms 3 and said ring supports said bevel gear against upward movement. A

pin fl t passed through said ring 43 and en tering a vertical groove 45 in the tube 33,

prevents said tube from turning. I It will readily be seen that, by screwing the shaft 38, the pinion 37, and therefore also the bevel wheel 36, can be turned so that the ."tube- 33 moves up or down, and therefore the dregree of compression of said coiled spring isvaried, and consequently the resistance that "said spring offers to the suction of the'engine is also varied, and therefore also the/size oit the inlet air opening, and

the proportion of air to the mixture. 1 ,1

An important feature of my invention is the'mcans provided forventing the float chamber. Heretofore, incarbureters, so far as I am aware, such means have been open to the objection that the vent was liable to be closed by the liquid gasolene. in case r of excessive tipping of the carbureter. In my invention, the casing 3 of the air chainber is formed witha partition 48 extending upper end-of which is at a very considerable 50 is located in the top ofthis cavity, and

upwardly in such a direction as to form a narrow vertical conduit or cavity 49, the

it will be seen that it is in such position that it is impossible for it to be'submerged in gasolene by a tilting of the"carbureter through an angle of 45, that is, by any ordinary use of thecarbureter.

I claim f 1. In a carburetor, the combination of an air chamber casing formed with a valve seat, -a valve resting on said seat and having a tubular depending portion, the aperturebf the tube extending through the valve, the

air chamber casing being formed with a guide for said tubular depending portion, said tubular depending portion being formed with air passages leading directly through the same and wholly below said apertures when the valve is seated, said tubular depending portion being provided at its center with a narrow fluid field conduit spaced therefrom and extending to a point above the air openings in said tubulardepending portions, a thimble fitting snugly within the upper part of said depending portion, the upper edge of said thimble extending above the upper end of said depending portion,

and the lower edge extending below the tops lower end of said tube, said conducting means being arranged to be enlarged or eontracted by the rise or fall of the tube, and

means for adjustably supporting said spring fronrthe air chamber casing, comprising a ringsupported by said air chamber casing, a bevel gear Wheel supported bysaid ring and, internally threaded, an externally threaded ring screwed in said beveled Wheel and having an inwardly extending 'flange supporting the upper end of the spring, a

bevel pinion meshing with said bevel gear,

. ALiUs e. HATHCOOK.

Witnesses: I FRANCIS M. WRIGHT. 1). B. Brazilians. 

